This affects me too! Thanks for mentioning the LightDM workaround.

I had hold down the Shift key to boot into recovery mode, then run
"dhclient eth0" to get network connectivity, then run "apt install
lightdm" to install LightDM then in the prompt select LightDM as the
default login manager. If LightDM is already installed, you can run
"dpkg-reconfigure lightdm".

To start troubleshooting the issue you can run "journalctl
/usr/sbin/gdm3" but I didn't find anything interesting. You can also use
the GNOME Logs application.

I found that unix_chkpwd reports "could not obtain user info (gdm-
greeter)" which might be a hint.

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https://bugs.launchpad.net/bugs/2121069

Title:
  Login screen does not show

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